Passive film formation and corrosion initiation in lightweight concrete structures as compared to self compacting and ordinary concrete structures at elevated temperature in chloride rich marine environment

• Corrosion of RC structures is one of the most critical durability concerns.
• Passive film formation and corrosion in OC, SSC and LWC concrete types.
• Samples analysed with 5% and 3% chloride kept at 30, 40 and 50 °C.

Corrosion of reinforced concrete is one of the most critical durability concerns in the construction field. Researchers and engineers are examining and determining the performance of various types of reinforced concrete in saline and under various environmental conditions. This research is also a contribution to such corrosion studies and it aims at investigating passive film formation and the corresponding corrosion and its extent in the ordinary (OC), self-compacting (SSC) and lightweight concrete (LWC) structures at normal and elevated temperature. For this purpose total of 18 specimen including 6 specimens of each OC, SCC and LWC were prepared with 5% and 3% total chloride, respectively and kept in environmental chambers at 30, 40 and 50 °C. After six months of corrosion observations i.e., corrosion potentials, currents and gravimetric mass loss, interesting and novel results were obtained on comparing the corrosion observations of all the above types of concrete.